Maybe I'm alone, but I'm not too excited about the lower rear bumper of the ZHP (except for the exhaust & lip spoiler- ). Too tame and too much like the non-ZHP/ZSP treatment. I think the ZSP rear has an edgier more aggressive look.

I prefer the M-Tech II look. It integrates the exhaust tips better. The ZSP rear bumper has two horizontal lines that cut above the tips, so they are off on their own below the bumper, whereas the ZHP bumper gives the tips their own space next to the black lip. The shape of the black cut shares a lot of similarity with the E39's M-Tech rear spoiler that came on the 2003 540i 6-speed (same cut line as the E39 M5).